|Name|State of residence|Took office|Left office|President served under|
|---|---|---|---|---|
|Karl Rove|Texas|January 21, 2001|August 31, 2007|George W. Bush|
|Barry Steven Jackson|Ohio|September 1, 2007|January 19, 2009|George W. Bush|
|Pete Rouse|South Dakota|January 20, 2009|October 1, 2010|Barack Obama|
|David Axelrod|Illinois|January 20, 2009|January 10, 2011|Barack Obama|
|David Plouffe|Delaware|January 10, 2011|January 25, 2013|Barack Obama|
|Valerie Jarrett|Illinois|January 20, 2009|present|Barack Obama|
|Daniel Pfeiffer|Delaware|January 25, 2013|present|Barack Obama|

Question: how many years did david plouffe serve?
Answer: 2